Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 54 · 40 questions

The fast method (One-step multiplier): Increase by p%: multiply by (100 + p)% — up 20% is × 1.2. Decrease by p%: multiply by (100 − p)% — down 25% is × 0.75. Easy way to multiply: × the whole number (115 or 75), then ÷ 100.

1. 1.292 increased by 75% =
2. 2.420 increased by 5% =
3. 3.550 increased by 12% =
4. 4.535 decreased by 60% =
5. 5.700 increased by 20% =
6. 6.575 increased by 20% =
7. 7.628 decreased by 25% =
8. 8.130 decreased by 30% =
9. 9.360 decreased by 30% =
10. 10.310 decreased by 10% =
11. 11.608 increased by 25% =
12. 12.525 decreased by 12% =
13. 13.640 increased by 35% =
14. 14.270 increased by 20% =
15. 15.520 decreased by 30% =
16. 16.100 increased by 8% =
17. 17.400 decreased by 5% =
18. 18.234 increased by 50% =
19. 19.620 decreased by 75% =
20. 20.620 increased by 5% =
21. 21.106 decreased by 50% =
22. 22.800 increased by 5% =
23. 23.770 decreased by 10% =
24. 24.500 increased by 20% =
25. 25.376 decreased by 25% =
26. 26.580 increased by 60% =
27. 27.510 increased by 20% =
28. 28.60 increased by 50% =
29. 29.260 decreased by 20% =
30. 30.384 decreased by 25% =
31. 31.725 decreased by 12% =
32. 32.690 decreased by 10% =
33. 33.40 increased by 15% =
34. 34.464 decreased by 75% =
35. 35.292 increased by 75% =
36. 36.575 decreased by 20% =
37. 37.250 increased by 30% =
38. 38.530 increased by 10% =
39. 39.790 decreased by 30% =
40. 40.480 increased by 10% =

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